diff --git a/libexec/pyenv b/libexec/pyenv
index 979d69b6..fbdd880c 100755
--- a/libexec/pyenv
+++ b/libexec/pyenv
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 set -e
 
 if [ "$1" = "--debug" ]; then